#include <stdio.h>

int sum(int a, int b) {
	return a + b;
}

int sub(int a, int b) {
	return a - b;
}

int main015() {
	int (*ptr)(int, int);
	ptr = sum;
	printf("sum==%d\n", ptr(3, 2));
	ptr = sub;
	printf("sub==%d\n", ptr(3, 2));

	return 0;
}